1/32 scale decals

welcome masonme2. Have you tried www.squadron.com they are likely to have some.

I've searched several sources including Squadron and several of the major decal manufacturers, I've purchased 2 sets but they have markings for individual aircraft but no National markings.

Decal sheets for 1/32 get pretty crowded, so they assume you'll use the kit decals for National markings or buy a sheet of markings only. I don't build 1/32, but there are several 1/48 sheets for U.S. National markings, usually in different sizes on one sheet. Might try searching for the National markings, rather than just F-86's.